Effects of planting density on growth,quality and yield of pepper in greenhouse
In order to find out the effects of planting density on the growth,quality and yield of pepper in early spring greenhouse,Pujiao No.6 was used as the experimental material,and five density treatments were set up to study the ef-fects of different planting density on plants,fruits,chlorophyll content,photosynthetic characteristics,quality and yield of pepper in early spring greenhouse.The results showed that with the increase of planing density,the plant height increased significantly,but the plant width,stem diameter,fruit width and fruit length decreased gradually.With the increase of plant density,the chlorophyll content,net photosynthetic rate(Pn),stomatal conductivity(Gs)and transpiration rate(Tr)of pepper leaves showed a significant decrease trend,but the change trend of intercellular CO2 concentration(G)was oppo-site to that of net photosynthetic rate(Pn).The soluble protein content,soluble sugar content,and vitamin C content of pepper fruit decreased gradually,but the capsaicin content had no significant effects.The single fruit mass and commer-cial fruit number of pepper decreased with the increase of planting density,while the yield increased first and then de-creased.When the planting density treatment was 2223 plants·667 m-2,the yield was significantly higher than other treat-ments.In summary,the appropriate density of Pujiao No.6 is 2223 plants·667 m-2 in early spring greenhouse.
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